CT5 Turn Signal Warning Lights Need Expert Diagnosis

Had a similar situation with a 2017 CT4. The turn indicator system showed multiple faults, triggering dashboard warnings. After thorough diagnostics, the issue was traced to corroded connector pins in the main wiring harness that connects to the turn signal module. The bulb replacement itself wasnt the problem, the automotive lighting control module was getting inconsistent signals due to the deteriorated connections. This caused the system to misread the turn signals as failed bulbs. What starts as a simple turn signal fault can indicate deeper electrical issues. In my case, moisture had entered through a damaged grommet near the front lamp assembly, gradually affecting the wiring. The repair required cleaning the connections, replacing the damaged wiring section, and sealing the entry point. Before visiting a shop, check these points: Test all turn indicator bulbs, Inspect the flasher relay, Look for any visible wire damage near lamp housings, Check for moisture in light assemblies The issue is typically more involved than just replacing parts. Having proper diagnostic equipment is essential for pinpointing the exact fault in modern automotive lighting systems.

This hits close to home, I dealt with the exact same warning lights on my CT5 last month. The signal lamp errors were driving me crazy and I had similar dashboard messages. For me, the entire electrical fault was indeed traced to a faulty flasher relay and some corroded wiring near the front lamp assembly. Did the fixes you made solve the issue completely? Curious about the repair costs too since these electrical problems can get expensive. My lamp replacement and wiring repair ended up needing some extra work because they found additional corrosion while fixing the initial problem.

After repairing the electrical fault at the shop, my CT4s turn indicator system works flawlessly now. The technician found the root cause in a faulty cable connection, which was creating inconsistent signals to the automotive lighting module. The total repair came to 95€, which included fixing the connection and testing the entire turn signal system. The most important thing was identifying the exact issue, it wasnt just about replacing bulbs or the flasher relay. The diagnostic equipment pinpointed the problematic wiring, saving time and preventing unnecessary parts replacement. Since the repair, no more warning lights have appeared on the dashboard. The key was finding a shop with proper diagnostic tools for modern electrical systems. They were able to trace and fix the exact connection causing the turn signal problems without replacing unnecessary components. Considering how complex these automotive lighting systems are, the repair cost was reasonable and definitely worth it for a permanent solution.

Thanks for the feedback. I finally got the issue resolved after following up on the wiring suggestion. Had my car looked at by a certified shop that specializes in electrical diagnostics. They found the turn signal problems were caused by a combination of a worn flasher relay and water damage to the wiring harness near the front lamp assembly. The repair took about 3 hours and cost 280€ total, more than expected but they had to replace sections of the wiring harness and install a new signal lamp module. The mechanic showed me where moisture had corroded several connections, which explained the inconsistent turn indicator behavior. After the fix, all dashboard warnings cleared up and the automotive lighting system works perfectly now. No more error messages or flickering signals. While expensive, at least I know the underlying electrical issue was properly diagnosed and fixed rather than just having parts swapped out blindly like my previous shop attempted.